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Subgenus classification of Acanthamoeba by riboprinting
1Department of Parasitology, Kyungpook National University School of Medicine, Taegu, Korea. dichung@bh.kyungpook.ac.kr
The Korean Journal of Parasitology
|June 25, 1998
Summary
Riboprinting and 18S rRNA gene analysis clarify Acanthamoeba subgenus classification. This study reclassifies several Acanthamoeba strains, resolving taxonomic uncertainties for these opportunistic pathogens.
Area of Science:
- Microbiology
- Molecular Biology
- Taxonomy
Background:
- Subgenus classification of Acanthamoeba, a genus of ubiquitous protozoa, is challenging and requires robust molecular and phenotypic methods.
- Previous classifications based on morphology and limited genetic markers have led to taxonomic ambiguities.
- Accurate identification and classification of Acanthamoeba are crucial due to their roles as opportunistic pathogens and environmental inhabitants.
Purpose of the Study:
- To resolve the uncertain subgenus classification of Acanthamoeba using molecular techniques.
- To re-evaluate the taxonomic status of various Acanthamoeba reference strains, including (neo)type strains.
- To assess the utility of riboprinting for rapid identification of Acanthamoeba species.
Main Methods:
- Riboprinting was employed for subgenus classification of 23 Acanthamoeba reference strains, including 18 (neo)type strains.
- Polymerase chain reaction and restriction fragment length polymorphism (PCR/RFLP) analysis of the 18S ribosomal RNA gene (rDNA) were performed.
- Dendrograms were constructed based on riboprinting data to visualize genetic relatedness.
Main Results:
- Riboprinting analysis revealed distinct groupings, with two morphological group 1 type strains (A. astronyxis, A. tubiashi) diverging significantly.
- Morphological group 3 strains A. culbertsoni, A. palestinensis, and A. healyi were validated, while A. pustulosa was deemed a synonym of A. palestinensis.
- Morphological group 2 strains were classified into 6 subgroups, with A. griffini showing high divergence due to an 18S rDNA intron; an 'A. castellanii complex' was identified, and several species were proposed as synonyms (e.g., A. quina, A. lugdunensis as A. castellanii).
Conclusions:
- Riboprinting is a valuable tool for Acanthamoeba subgenus classification, offering a reliable method for resolving taxonomic uncertainties.
- The study proposes reclassifications and synonymies for several Acanthamoeba species, contributing to a more stable taxonomy.
- Riboprinting holds promise for the rapid identification of Acanthamoeba from clinical and environmental samples, aiding in diagnostics and ecological studies.